// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_TASK_SCHEDULER_SCHEDULER_LOCK_IMPL_H
#define BASE_TASK_SCHEDULER_SCHEDULER_LOCK_IMPL_H

#include <memory>

#include "base/base_export.h"
#include "base/macros.h"
#include "base/synchronization/lock.h"

namespace base {

class ConditionVariable;

namespace internal {

    // A regular lock with simple deadlock correctness checking.
    // This lock tracks all of the available locks to make sure that any locks are
    // acquired in an expected order.
    // See scheduler_lock.h for details.
    class BASE_EXPORT SchedulerLockImpl {
    public:
        SchedulerLockImpl();
        explicit SchedulerLockImpl(const SchedulerLockImpl* predecessor);
        ~SchedulerLockImpl();

        void Acquire();
        void Release();

        void AssertAcquired() const;

        std::unique_ptr<ConditionVariable> CreateConditionVariable();

    private:
        Lock lock_;

        DISALLOW_COPY_AND_ASSIGN(SchedulerLockImpl);
    };

} // namespace internal
} // namespace base

#endif // BASE_TASK_SCHEDULER_SCHEDULER_LOCK_IMPL_H
